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Welcome, I'm Chris (aka Moose).
If you start it and hold a little throttle can you prevent this stall from occurring?
If you crank it with throttle applied will it start without the 20 minute wait?
This start issue is that when the engine is cold or hot?
For the gauge issue, that is going to be a instrument cluster beginning to fail, the cluster is losing power or ground or a charging system issue. I recommend you cut the cord on an old cell phone charger and wire it to a digital volt ohm meter attached to your dash with some tape. When the cluster messes up make sure the power outlet is showing 13-15 volts. If it is then the charging system is not over or under charging and to blame.
For the start issue, when it will not start, that is when we need to to the diag. We need to find out what is missing, fuel or spark. I recommend doing a fuel pressure test first before testing for injector pulse and ignition spark. In the event all are good during this crank no start then I would look into a leaking injector, one or more that is flooding the engine and preventing plug spark from occurring.
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Hello Chris here again,
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